Taxilejeunea pulverulenta (Lejeuneaceae, Jungermanniopsida), a poorly known species from the Neotropics, is transferred to Lejeunea

Lejeunea pulverulenta comb. nov. (basionym Taxilejeunea pulverulenta), a species known from Guadeloupe, Ecuador and Mount Roraima, Guyana is described and illustrated. The species is characterized by its yellowish-green and dull colour in the herbarium, cells with trigones, intermediate thickenings and strongly papillose and water-repellent surface, small inflated lobules, imbricate and large underleaves with auriculate bases, gynoecia terminal on short branches with again fertile innovations, up to three gynoecia in a row. A comparison of Lejeunea pulverulenta with the morphologically closely related L. cerina and L. controversa is provided. Characteristics of the genus Taxilejeunea are briefly discussed. A lectotype for Taxilejeunea pulverulenta is designated.